Chennai Metro Phase 2, India

Postado em Novembro 8, 2024Novembro 8, 2024 por Kansuda Visesthanakorn

Chennai Metro Phase 2, India

The Chennai Metro Phase 2 project is set to redefine urban transportation in one of India’s largest cities, promising enhanced connectivity and efficiency. Playing a pivotal role in the success of this ambitious project, Dextra has supplied an array of cutting-edge construction solutions to meet the project’s demanding structural and safety requirements.

Ensuring Robust Connections with Bartec Rebar Couplers

Dextra supplied nearly 2 million Bartec rebar couplers, essential for creating secure connections across various structural components. These couplers have been utilized extensively in the connections for diaphragm wall (d-wall) caging and slabs, pile cages, piers, and pier caps. By ensuring high-strength rebar connections, Bartec couplers contribute to the overall durability and resilience of the metro structure, particularly important in a densely populated and busy urban environment like Chennai.

Precision Testing with Sonitec CSL Testing Tubes

To ensure the highest standards of concrete integrity, Dextra provided over 80,000 Sonitec crosshole sonic logging (CSL) testing tubes. These tubes facilitate rigorous testing of piles and d-walls, helping to identify potential flaws within the concrete structure. This meticulous testing process enables project engineers to detect and address any irregularities, safeguarding the integrity and longevity of the metro’s foundations.

Supporting Complex Structures with CR Bar 1080 Post-Tensioning Bars

For the support of double-decker piers and the pre-tensioning of U-girders, Dextra supplied 68 CR Bar 1080 post-tensioning bars. These high-strength, fully threaded bars are critical in handling the complex loads and stresses that the elevated sections of the metro will endure. The inclusion of these bars ensures that the metro can withstand heavy traffic and operational demands over time, contributing to the long-term safety and functionality of the infrastructure.

Facilitating Tunnel Boring with GFRP Soft-Eyes

In the tunneling phase, Dextra also provided 42 GFRP soft-eyes, specifically designed for tunnel boring machine (TBM) operations. These soft-eyes allow TBMs to pass through concrete walls smoothly, ensuring safe and efficient tunneling while reducing the risk of structural damage. GFRP’s non-corrosive properties make it an ideal choice for underground construction, where durability and performance are paramount.

Building a Safer, Stronger Future

Dextra’s commitment to supplying top-tier construction materials and solutions underscores its dedication to the Chennai Metro Phase 2 project. As the metro takes shape, Dextra’s innovations contribute not only to the project’s success but also to the future of Chennai’s urban infrastructure, setting new standards in construction excellence and sustainability.

Mumbai Metro Line 2B, India

Postado em Setembro 25, 2024Setembro 25, 2024 por Kansuda Visesthanakorn

Mumbai Metro Line 2B, India

O Mumbai Metro Line 2B, an essential link connecting several key areas of the city, is a significant infrastructure project aimed at alleviating Mumbai’s traffic congestion and providing efficient public transport. As part of this ambitious project, Dextra has made a valuable contribution, supplying engineered construction materials to ensure the durability and reliability of the structure.

CR Bar 1080 for U-Girder Stressing and Pre-Tensioning

One of the critical components of the project is the elevated section of the metro, which relies on U-girders for support. To enhance the strength and resilience of these U-girders, Dextra supplied its innovative CR Bar 1080 cold-rolled fully threaded post-tensioning bars. These bars, with a diameter of 75mm, are specifically designed to withstand high stress during both U-girder stressing and pre-tensioning operations. The hexagonal nuts provided as part of the system allow for secure fastening and easy adjustment, ensuring precise tensioning to meet the structural demands.

Fully Threaded (FT) Bar for Segment Stitching and Temporary Stressing

For segment stitching and temporary stressing operations during the construction of the metro viaduct, Dextra supplied its fully threaded (FT) bars. These bars provide secure connections between precast segments and offer flexibility for adjustments during the stitching process, ensuring that the structural alignment is perfect before the segments are permanently joined.

Unitec Couplers for Rebar Connections

In addition, Dextra supplied Unitec couplers, designed for connecting rebars at construction sites without the need for pre-threading. These couplers offer a convenient and robust solution, allowing for seamless connection of two rebars, ensuring structural continuity and strength without delays in the construction process.

Sonitec CSL Testing Tubes for Concrete Pile Integrity

In addition to supplying post-tensioning bars, Dextra also provided Sonitec Crosshole Sonic Logging (CSL) testing tubes for the integrity testing of the concrete piles supporting the metro structures. These tubes enable highly accurate non-destructive testing of the concrete, allowing engineers to detect any potential flaws or weaknesses in the piles. This testing is vital for ensuring the piles meet the necessary strength and quality standards, thereby supporting the entire metro system safely and effectively.

Enhancing Metro Connectivity with Quality Solutions

As the Mumbai Metro Line 2B progresses towards completion, Dextra’s contributions to the project highlight its role in providing advanced engineering solutions for infrastructure development. The combination of Barra CR 1080 for post-tensioning, fully threaded bars for segment stitching, Unitec couplers for rebar connection, and Sonitec CSL testing tubes for pile integrity showcases Dextra’s commitment to quality, innovation, and safety in major construction projects.

By contributing to this key metro line, Dextra is playing a part in shaping the future of urban mobility in Mumbai, ensuring that the metro system will be reliable and capable of supporting the city’s growing transportation needs for years to come.

Central Kowloon Route (CKR) – Central Tunnel, Hong Kong

Postado em Setembro 11, 2024Outubro 24, 2024 por Kansuda Visesthanakorn

Central Kowloon Route (CKR) – Central Tunnel, Hong Kong

Dextra played a pivotal role in the construction of the Central Kowloon Route (CKR) – Central Tunnel project in Hong Kong by supplying Fortec+ couplers, along with steel rock bolts, expandable friction bolts, umbrella pipes, and post-tensioning bars for tunneling works. These mechanical rebar couplers were integral in ensuring strong and reliable connections within the road tunnel structure, meeting the stringent requirements for safety and durability.

The CKR, a major infrastructure project aimed at improving traffic flow across Kowloon, required advanced construction techniques. Dextra’s Fortec+ couplers, used in locations such as precast panels, tunnel access points, and driveways, contributed significantly to the project’s structural integrity and long-term performance. The Fortec+ system includes a rebar preparation process in which the threaded bar end is proof tested with a tensile load, ensuring non-destructive testing within the elastic zone of the reinforcing bar.

Image credit: Central Kowloon Route – Highways Department

San Shek Wan Sewage Treatment Works, Hong Kong

Postado em Agosto 2, 2024Agosto 2, 2024 por Kansuda Visesthanakorn

San Shek Wan Sewage Treatment Works, Hong Kong

The San Shek Wan Sewage Treatment Works (STW) project in Hong Kong marks a significant step towards addressing the sewage disposal needs of the South Lantau region. As the population of South Lantau is projected to grow, with an ultimate population reaching approximately 12,600 by 2039, the sewage flow is anticipated to increase to 5,800 m³/day. To accommodate this, a comprehensive sewerage system is being constructed, which includes a trunk sewerage system for Pui O area, a secondary STW at San Shek Wan, and a village sewerage system for Lo Uk.

A critical component of this ambitious infrastructure project is the use of advanced materials and technologies to ensure its successful and sustainable completion. Dextra, a global leader in engineered construction products, has played a pivotal role by supplying Glass Fibre Reinforced Polymer (GFRP) soil nails for the excavation and lateral support (ELS) works.

The Role of GFRP Soil Nails in ELS Works

The excavation and lateral support works are essential to the project’s foundation and stability. The challenging geotechnical conditions in Hong Kong, characterized by complex soil and rock formations, necessitate the use of robust and reliable reinforcement solutions. GFRP soil nails, provided by Dextra, are ideal for such conditions due to their high tensile strength, corrosion resistance, and lightweight nature.

GFRP soil nails are used to stabilize slopes and excavations, preventing landslides and soil erosion. Their corrosion resistance is particularly beneficial in environments exposed to moisture and chemicals, such as sewage treatment works. This ensures a longer lifespan and reduced maintenance costs compared to traditional steel reinforcement.

Benefits of Dextra’s GFRP Solutions

Corrosion Resistance: Unlike steel, GFRP does not corrode when exposed to harsh environmental conditions. This makes it an excellent choice for the wet and chemically aggressive conditions present in sewage treatment works.
High Strength-to-Weight Ratio: GFRP offers a high tensile strength comparable to steel but at a fraction of the weight. This ease of handling and installation translates to time and labor savings.
Durability: The longevity of GFRP soil nails ensures the structural integrity of the excavation and lateral support systems over the extended operational life of the sewage treatment works.
Sustentabilidade: By using GFRP, the project reduces its reliance on steel, thereby contributing to more sustainable construction practices.

Impact on the San Shek Wan STW Project

Dextra’s involvement and the implementation of GFRP soil nails have significantly enhanced the efficiency and sustainability of the San Shek Wan STW project. The advanced materials have ensured that the excavation and lateral support works are not only robust and reliable but also cost-effective over the long term.

Upon completion, the sewage from South Lantau will be conveyed to the newly constructed STW for proper treatment. The treated effluent will then be safely discharged into the sea about 1.4 km off the South Lantau coast, ensuring minimal environmental impact. This project represents a crucial infrastructure upgrade that will support the region’s growth and development while maintaining high environmental and operational standards.

Cairo Monorail Bowstring Bridge, Egypt

Postado em Julho 5, 2024Julho 5, 2024 por Kansuda Visesthanakorn

Cairo Monorail Bowstring Bridge, Egypt

The Cairo Monorail Bowstring Bridge project, a pivotal part of Egypt’s expanding urban infrastructure, has significantly benefited from the expertise and quality products supplied by Dextra. Known for their innovative engineering solutions, Dextra provided critical materials to support the construction of this state-of-the-art transportation link.

In particular, Dextra supplied tension rods in two distinct specifications for the project:

M78/OD75 in Grade CS520 – A total of 60 sets were delivered.
M83/OD80 in Grade CS520 – An additional 8 sets were provided.

These tension rods were specifically used as hangers for the bowstring bridge, ensuring a high level of strength and durability, which is crucial for the safety and longevity of the bridge, to maintain structural integrity and withstand the stresses of daily monorail operations.

Dextra’s tension rods, known for their high tensile strength and resistance to environmental factors while providing architectural pleasure, played a critical role in meeting these demands. This involvement underscores the importance of reliable and advanced engineering solutions in modern infrastructure projects, highlighting Dextra’s commitment to excellence and innovation in the field of civil engineering.

Cross Island Line (CRL) MRT, Singapore

Postado em Junho 12, 2024Julho 19, 2024 por Kansuda Visesthanakorn

Cross Island Line (CRL) MRT, Singapore

Dextra has played a pivotal role in the construction of Singapore’s Cross Island Line (CRL) MRT project, supplying Glass Fiber Reinforced Polymer (GFRP) soft-eyes, Bartec couplers and Barras com cabeça for several crucial packages. Dextra continues to support the ongoing packages of this extensive project.

The CRL is set to become Singapore’s eighth MRT line and its longest fully underground line, stretching over 50 kilometers. The project is being executed in three phases, with the first phase anticipated to be operational by 2030.

To minimize the environmental impact on the forested areas of the nature reserve, engineering solutions were meticulously chosen to further mitigate environmental disruption. These solutions include digging deeper into the ground and employing a large diameter boring machine, capable of accommodating two train tracks within a single tunnel. This approach not only reduces the surface footprint but also enhances the efficiency of the tunneling process.

Tunnel Boring Machines (TBMs) are a staple in Singapore’s subterranean infrastructure projects, adept at operating under a variety of ground conditions. The use of GFRP soft-eyes supplied by Dextra is integral to these operations. Soft-eyes are essential components in TBM tunneling, acting as temporary openings that allow the TBM to break through concrete walls without compromising structural integrity. The GFRP material is preferred for its high strength-to-weight ratio, corrosion resistance, and ease of installation, ensuring safe and efficient tunneling operations.

Dextra‘s expertise and reliable supply of GFRP soft-eyes, Bartec couplers and headed bars have significantly contributed to the progress of the CRL project, aligning with Singapore’s commitment to sustainable and innovative infrastructure development. As the CRL project advances, Dextra remains a key partner, supporting the construction of this monumental MRT line that will eventually enhance the daily commute for millions of Singaporeans.

Grand Paris Express – Line 14

Postado em Novembro 5, 2022Setembro 26, 2024 por Sir Gwi

Grand Paris Express – Line 14

O Grand Paris Express é um grande projeto de transporte urbano que ocorre em toda a capital francesa. O projeto irá adicionar 4 novas linhas (linhas 15, 16, 17 e 18) e ampliar duas linhas existentes (11 e 14).

A Dextra esteve envolvida nos pacotes de diversas estações através de seus parceiros distribuidores locais. Na linha 14 em particular, a Dextra forneceu acopladores de vergalhão Fortec nas estações de Orsay e Pont Cardinet.

Para a estação Bagneux, no norte de Paris, localizada no cruzamento da linha 4 do metrô e da futura linha 15, a Dextra forneceu suas âncoras ativas ASTEC.

As âncoras ativas ASTEC são a solução preferida para obras em estações de metrô, pois as máquinas de perfuração de túneis e os equipamentos de movimentação de terras podem simplesmente cortar os tendões de FRP das âncoras em qualquer estágio, eliminando qualquer necessidade de remoção não confiável e dispendiosa das âncoras. A solução foi aprovada para este projeto pela consultoria SYSTRA.

Depois de numerosos projetos de sucesso no Oriente Médio, esta foi a primeira vez que as Âncoras Ativas ASTEC (uma inovação recente da Dextra) foram instaladas na Europa.

Expansão da Fase 1 da Obra de Tratamento de Esgoto Sha Tau Kok

Postado em Novembro 4, 2022Agosto 2, 2024 por Sir Gwi

Expansão da Fase 1 da Obra de Tratamento de Esgoto Sha Tau Kok

The Sha Tau Kok Sewage Treatment Works Phase 1 Expansion project stands as a testament to Hong Kong’s commitment to environmental sustainability and efficient wastewater management. It aims to increase the treatment capacity, ensuring that the city’s sewage is processed efficiently and in an environmentally responsible manner. A remarkable feature of this expansion is the use of Groutec S couplers to seamlessly link precast columns of the building.

Groutec is designed for the efficient and easy installation of precast concrete elements, reducing construction time and labor costs while providing full structural connection. For this project, Groutec S diameter 32mm precast couplers have been used to connect precast columns in vertical applications. The Groutec coupler is installed in the bottom element, and then grout is poured by gravity directly into the coupler cavity. This process ensures the structural integrity and longevity of the facility.

Estação Msheireb do metrô de Doha

Postado em Novembro 4, 2022Março 15, 2024 por Sir Gwi

Estação Msheireb do metrô de Doha

A Estação Msheireb é a principal estação de intercâmbio do Metrô de Doha. Localizado no centro de Doha, conecta todas as três linhas (Vermelha, Verde e Ouro) e fornecerá uma porta de entrada para os estádios da Copa do Mundo FIFA 2022.

A Estação Msheireb se tornará uma das maiores estações de metrô do mundo em tamanho.

Olhos suaves para TBMs

Para este grande projeto, a Dextra projetou e forneceu entre 2013 e 2015 8 grandes Soft-Eyes ASTEC GFRP, com diâmetro de 8 metros cada. Soft Eyes são gaiolas de vergalhões GFRP, posicionadas nas D-Walls entre os segmentos de aço. Os Soft-Eyes GFRP permitem que as máquinas de perfuração de túneis (TBMs) passem em um tempo mínimo, pois as barras podem ser facilmente esmagadas pela máquina de túnel.

Âncoras de amarração

Para ancorar as enormes paredes D e evitar qualquer deslocamento do solo durante os trabalhos de escavação, a Dextra também forneceu as suas âncoras ativas ASTEC (AAA). Essas inovadoras âncoras pós-tensionadas baseadas em GFRP têm a vantagem de serem cortadas pelas perfuradoras de túneis ou por equipamentos de escavação padrão. Por ser facilmente cortado, não precisa ser retirado do solo, mesmo quando utilizado para aplicações temporárias.

No caso das estações Msheireb, âncoras multitendões (10 por âncora neste projeto) foram instaladas no centro de Soft-Eye para ancorar o D-Wall. Essas âncoras também foram cortadas durante a abertura do túnel (visível no vídeo abaixo). No total foram instaladas 150 âncoras na estação.

Banguecoque BTS

Postado em Novembro 4, 2022Março 15, 2024 por Sir Gwi

Banguecoque BTS

O Sistema de Transporte de Massa de Bangkok (BTS) é um grande sistema urbano de skytrain localizado em Bangkok, capital da Tailândia. O sistema foi inaugurado em 1999.

A partir de 2017, o sistema consiste em 24 estações elevadas e 37 km de trilhos elevados organizados em duas linhas principais que se cruzam na estação central do Sião.

O sistema BTS está passando por uma extensão de suas duas linhas principais, com segmentos de linha e estações previstas para entrar em operação em 2019 e 2020.

Fundações

Para vários pacotes ao longo dos anos, a Dextra forneceu tubos Sonitec, que são usados para testar as fundações de estacas de concreto abaixo das estações e dos trilhos.

No total, a Dextra forneceu aproximadamente 40 mil metros lineares de tubos Sonitec, distância na verdade equivalente ao comprimento do próprio sistema BTS.

Pilões

Para conexões de barras verticais em postes, a Dextra ofereceu seus
Bartec conexão.
Bartec permite emendar convenientemente gaiolas de vergalhões pré-fabricadas usando um simples acoplador de vergalhões, permitindo economia de aço em comparação com a sobreposição e acelerando as operações no local.

Na Tailândia, a operação de rosqueamento é suportada pela fábrica da Dextra, convenientemente localizada no Nordeste de Bankgok. Os empreiteiros recebem o vergalhão já preparado e montado com seu acoplador de vergalhão.

Categoria: Trilhos, Metrô e Túneis